The BGS Lexicon of Named Rock Units — Result Details

Pendle Grit Member

Computer Code: PG Preferred Map Code: PG
Status Code: Full
Age range: Pendleian Substage (CE) — Pendleian Substage (CE)
Lithological Description: Medium- to coarse-grained feldspathic sandstone with subordinate interbedded siltstone and mudstone. Commonly in sharp based beds from 0.2 to 4.5m thick, which are distinctly massive internally.
Definition of Lower Boundary: Commonly a gradational coarsening upwards change from the underlying mudstone and siltstone of the Bowland Shale Formation means that the base is taken at the point in the sequence where sandstone becomes predominant.
Definition of Upper Boundary: Taken at the point in the sandstone succession where cross-bedded sandstones of the Warley Wise Grit become evident.
Thickness: From c.200m at the northern margin of the Lancaster district to c.475m on Longridge Fell, and an average of 457m in the Clitheroe district.
Geographical Limits: Widespread in the Craven Basin in Lancaster, Settle, Garstang, Clitheroe, Bradford sheet areas.
Parent Unit: Pendleton Formation (PENDL)
Previous Name(s): Pendle Grits (-2975)
Pendle Grit Formation (-3610)
Alternative Name(s): Equivalent To Pendle Top Grit.
Equivalent To Skipton Moor Grit.
Stratotypes:
Reference Section  Left bank of the River Ribble 450 to 820m northeast of Salesbury Hall, showing top 46m and the junction with the overlying Warley Wise Grit Formation. 
Reference Section  Trough of Bowland, Lancashire: banks of stream immediately west of the Trough of Bowland road. 
Type Section  Little Mearley Clough, Pendle Hill, Lancashire. Stream section south-east of Little Mearley Hall at top and highest slope of Pendle Hill escarpment. 
Reference(s):
Moseley, F, 1954. The Namurian of the Lancaster Fells. Quarterly Journal of the Geological Society of London, Vol.109, 423-454. 
Aitkenhead, N, Bridge, D M, Riley, N J and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) 
Stephens, J V, Mitchell, G H and Edwards, W N. 1953. Geology of the country between Bradford and Skipton. Memoir of the Geological Survey of Great Britain, Sheet 69 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E060 E067 E068 E069 E059 E070 E048